진주담치 Mytilus edulis 의 성분에 관한 연구

최우현 한국수산학회 1970 한국수산과학회지 Vol.3 No.1

경남 충무 북만산 진주담치 Mytilus edulis에 대하여 3월에서 12월까지 매월 2회씩 화학성분 조사를 실시한 바 그 결과를 요약하면 다음과 같다. 1. 수분 함량은 5∼6월간이 81.3%로 약간 증가 현상을 나타내었고 평균치는 78.5%였다. 2. 조단백질은 9∼10월중에 최대치인 13.7%를 나타내었으며 평균치는 12.8%인바 큰 변화를 찾아볼 수 없고, 굴 또는 다른 조개류에 비하면 그 함량이 많음을 알 수 있었다. 3. 지질은 평균 2.5%로 계절에 따른 변화는 거의 없었다. 4. 당질은 9∼10월중에 최대치가 약 5%까지 도달하였으며 평균치는 4.3%로서 다른 패류에 비해서 많은 편이다. 5. 조회분은 평균치 1.5%로 11∼12월중에 최대치인 2%내외를 나타내었고 인산염은 평균 963㎎%, 철분은 188㎎%, 칼슘은 82㎎%로서 다른 어패류에 비하면 풍부한 무기질을 함유하고 있었다. 6. pH는 6.02∼6.55 사이에서 큰 변화가 없었으나 겨울철이 여름철로다 조금 높았다. 7. 구성 아미노산중 특히 함량이 많은 것은 Glutamic acid, Aspartic acid, Lysine, Glycine의 순이었고 비교적 함량이 적은 것은 Valine, Proline, Arginine, Alanine, Leucine, Threonine, Serine, Isoleucine, Histidine, Tyrosine, Phenylalanine, Methionine의 순이었다. 8. 우리나라 진주담치는 9월을 정점(頂點)으로 하여 8∼10월에 가장 영양 성분이 풍부함을 알았다. This paper deals with the proximate composition of the cultured sea mussel (Mytilus edulis) which are distributed along the whole coastline of Korea, particularly abundant in the southern coast. Studies on seasonal variation in chemical constituents of the mussel at Northern Bay of Choongmu were carried out from March to December 1968 and the results obtained are as follows: 1. Moisture content in mussel meat was 78.5% on the average; the maximum amounted to 81.3% during May-June, while the minimum was 77.8% in September. 2. Crude protein was in the range of 10.9-13.7% ; the maximum was in September-October, the minimum appeared in March, and the average value was 12.8%. 3. Lipids on the average was 2.5% and there was no markable difference between the high and low contents. 4. Total sugar was 5% during September-October in its highest, while there appeared minor contents during winter season. 5. Crude ash on the average was 1.5% the and maximum was in November-December. As for minerals in the ash, 963㎎% of phosphate, 82㎎%o of calcium, and 188㎎% of iron were found respectively. 6. pH was in the range of 6.02-6.55, but it generally declined to acidity in the summer season. 7. In amino acid contents, there found 16 kinds; 710㎎% of glutamic acid, 696㎎% of aspartic acid, 383㎎% of lysine, 225.4㎎% of valine, 225.1㎎% of proline, etc. 8. The amounts of protein, lipids and total sugar are tend to increase from August to October, particularly in September.

석회석미분말을 첨가한 친환경 도로포장용 콘크리트의 알칼리-실리카 반응성 평가

최우현,박철우,김승원,정원경,전범준 한국도로학회 2012 한국도로학회 학술대회 발표논문 초록집 Vol.2012 No.03

Application of Plasma Arc Welding for Anti-Corrosive Material with High Molybdenum Content

최우현,정찬우,박주용 대한용접접합학회 2020 대한용접·접합학회지 Vol.38 No.3

Plasma arc welding (PAW) is an arc welding process similar to gas tungsten arc welding, in which an electric arc is formed between a non-consumable tungsten electrode and the workpiece. When used for cutting, the plasma gas flow is increased instead of the PAW so that the deeply penetrating plasma jet cuts through the metal, and the molten metal is continuously removed as the cutting process progresses. A plasma is a gas heated to an extremely high tem�perature and ionized such that it becomes electrically conductive. Although very high temperatures are applied dur�ing the PAW process, the arc flame is narrow and deep and moves at a very high speed. Thus, only a small amount of heat is transferred to the weld. A filler metal can be used, depending on the joint conditions and the required me�chanical and chemical properties of the materials, particularly for thick materials or gapped joints. Two modes of the plasmawelding technique were used in actual welding fabrication: the keyhole and melt-in modes for the root run and final run, respectively.

함희토류 탄층: 비전통적 희토류 광체로서의 가능성에 대한 고찰

최우현,박창윤,Choi, Woohyun,Park, Changyun 대한자원환경지질학회 2022 자원환경지질 Vol.55 No.3

In general, the REE were produced by mining conventional deposits, such as the carbonatite or the clay-hosted REE deposits. However, because of the recent demand increase for REE in modern industries, unconventional REE deposits emerged as a necessary research topic. Among the unconventional REE recovery methods, the REE-bearing coal deposits are recently receiving attentions. R-types generally have detrital originations from the bauxite deposits, and show LREE enriched REE patterns. Tuffaceous-types are formed by syngenetic volcanic activities and following input of volcanic ash into the basin. This type shows specific occurrence of the detrital volcanic ash-driven minerals and the authigenic phosphorous minerals focused at narrow horizon between coal seams and tonstein layers. REE patterns of tuffaceous-types show flat shape in general. Hydrothermal-types can be formed by epigenetic inflow of REE originated from granitic intrusions. Occurrence of the authigenic halogen-bearing phosphorous minerals and the water-bearing minerals are the specific characteristics of this type. They generally show HREE enriched REE patterns. Each type of REE-bearing coal deposits may occur by independent genesis, but most of REE-bearing coal deposits with high REE concentrations have multiple genesis. For the case of the US, the rare earth oxides (REO) with high purity has been produced from REE-bearing coals and their byproducts in pilot plants from 2018. Their goal is to supply about 7% of national REE demand. For the coal deposits in Korea, lignite layers found in Gyungju-Yeongil coal fields shows coexistence of tuff layers and coal seams. They are also based in Tertiary basins, and low affection from compaction and coalification might resulted into high-REE tuffaceous-type coal deposits. Thus, detailed geologic researches and explorations for domestic coal deposits are required.

포장 기충재료로 활용하기 위한 섬유보강콘크리트의 강도특성

최우현,박철우,박종섭,정우태,장영재 한국도로학회 2011 한국도로학회 학술발표회 논문집 Vol.2011 No.3

아스팔트 프리캐스트 포트홀 응급보수 시스템 공법 개발

최우현,손덕수,김지원 한국도로학회 2015 도로 : 도로학회지 Vol.17 No.2

농업용수의 수요공급 현황 및 향후 전망

최우현,Choi Woo Hyun 한국관개배수위원회 2005 한국관개배수논문집 Vol.12 No.1

로봇을 이용한 알고리즘 학습이 중학생의 논리적 사고에 미치는 영향

최우현,이희복,정기주,김준태,석효준,박상태 공주대학교 과학교육연구소 2016 과학교육연구 Vol.46 No.1

In the knowledge-based society, the ability to effectively address the problem situation is important when a new situation facing the creation of ideas, as well as any facts to know through the application. Problem solving ideas and methods on the context creativity, problem solving, logical thinking and higher cognitive thinking skills, such as can be obtained through the algorithm of these higher cognitive thinking skills through training. In this study, physics gifted middle school students who studied the process of logical thinking and problem solving to improve the way in which previous studies have been performed in addition to the learning algorithm was studied. In order that to see if they have any effect learning algorithm, GALT, problem solving assessment of PISA 2003 and etc was utilized. Based on analysis result, the conclusion is that learning algorithm using a robot is useful for improvement overall problem solving skills, variable controlling reasoning and combinational reasoning.

석회석미분말을 함유한 친환경 시멘트콘크리트의 도로포장 적용을 위한 기초 연구

최우현,박철우,정원경,김기헌 한국도로학회 2012 한국도로학회논문집 Vol.14 No.4

PURPOSES: This study is to investigate the fundamental properties of limestone added cement concrete for application of pavement. METHODS : As the production of Portland cement causes environmental problems, engineers have sought more environment-friendly concrete construction materials. Limestone powder can be used for concrete as a partial replacement of Portland cement. One of the great applications of limestone powder added cement concrete might be a cement concrete pavement since the concrete pavement consumes massive quantity of Portland cement. Experimental variables were different replacement level of limestone powder by 0% to 25% with 5% increment. Before hardening of fresh concrete, setting time and plastic shrinkage characteristics were investigated in addition to other basic properties. Properties of hardened concrete included compressive, tensile and flexural strength as well as drying shrinkage. RESULTS : The addition of limestone powder did not significantly affect the properties of fresh concrete. Strength deceased as the replacement ratio increased and when the replacement ratio was greater than 10% decrease rate increased. CONCLUSIONS : It was found that the partial replacement of the limestone powder to cement in pavement materials can be positively considered as its mechanical properties show comparable performance to those normal concrete.

석회석미분말을 첨가한 친환경 시멘트콘크리트의 내구 특성

최우현,박철우,정원경,전범준,김규선 한국구조물진단유지관리공학회 2012 한국구조물진단유지관리공학회 논문집 Vol.16 No.5

시멘트를 생산할 때 발생하는 이산화탄소로 인하여 콘크리트를 활용하는 건설산업의 친환경성이 문제시 되어가고 있는 실정이다. 이에 본 연구에서는 석회석미분말로 시멘트를 대체하는 기술의 기초연구로서 석회석미분말을 함유한 콘크리트의 내구특성에 관하여 특성을 파악하고자 하였다. 실험변수는 석회석미분말의 시멘트 치환률을 0%에서 25%까지 5%씩 중가하였으며 동결융해 저항성, 제설염 저항성 및 알칼리-실리카반응 저항성 등의 내구특성과 기초적인 경화특성 등을 분석하였다. 석회석미분말의 사용으로 인한 동결융해저항성, 제설제염 저항성 등의 영향은 거의 없는 것으로 나타났으며 또한 알카리-실리카반응성의 억제를 위하여도 긍정적으로 검토될 수 있을 것으로 판단된다. During the manufacturing of Portland cement, CO2 gas is also necessarily produced through both decarbonation of calcium carbonate and kiln burning. By partially replacing the Portland cement with limestone powder, which is an inert filler in a concrete mixture, CO2 consumption can be reduced in a construction field. This study is to investigate the fundamental durability characteristics of limestone powder added concrete. Experimental variable was the replacement ratio of limestone powder from 0% to 25% with 5% increment. Durability characteristics were investigated by resistance to freeze-thaw, alkali-silica reaction and de-icing chemical in addition to the properties of fresh concrete. From test results, it was observed that the addition of limestone powder did not significantly affect the resistance to freeze-thaw reaction and de-icing chemical. The addition of limestone powder reduced the occurrence potential of alkali-silica reaction by reducing an alkali content in Portland cement.